What's the plural form of white turtlehead? Here's the word you're looking for.
Answer
The noun white turtlehead can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be white turtlehead.
However, in more specific contexts, the plural form can also be white turtleheads e.g. in reference to various types of white turtleheads
or a collection of white turtleheads.